CBSE Class 12-science Answered

Switch mode transformers (switching transformers) are used mainly in switching power supplies and DC-DC converters. (A transformer can be used to step up DC voltage).They provide a storage element for transferring energy from input to output in discrete packets as required in switching power supplies, regulators and converters.  The input voltage or charging cycle produces energy which is stored in the inductor. The input energy or discharge cycle is then transferred to the output. Boost or step-up switch mode transformers convert a lower DC input voltage to a higher DC output voltage of the same polarity. Buck or step-down converters are used to convert a higher DC input voltage to a lower DC output voltage of the same polarity.